JP5451408B2 - Tensioning mechanism - Google Patents

Description

  The present invention relates to a tension applying mechanism that urges the tension ring in a tension direction of a crawler belt wound around a tension ring and a plurality of rollers.

  Such a tension imparting mechanism is provided in a work vehicle such as a tractor and is configured to maintain the tension of the crawler belt by urging the tension ring in the tension direction of the crawler belt.

  Conventionally, in this type of tension applying mechanism, as shown in FIG. 7, a support member 21 that rotatably supports the tension ring 15, a rod 22 having an end fixed to the support member 21, and a plurality of rolling members. A pipe 23 fixed to the track frame 14 that supports the wheel, and the rod 22 is inserted into the pipe 23 so that the rod 22 is slidable in the tension and relaxation directions, and is fixed to the track frame 14. A receiving member 24; a spring receiving member 25 supported by the receiving member 24 so that the position of the receiving member 24 can be changed in the direction of tension and relaxation; an inner compression spring 26 extending between the supporting member 21 and the spring receiving member 25; A compression spring 27, and the receiving member 24 is fixed in a state of covering the end of the pipe 23 opposite to the support member 21.

  In the conventional tension applying mechanism, as the rod slides, dirt or mud enters the inside of the pipe through the gap between the end of the rod and the pipe on the support member side, and enters the space surrounded by the pipe and the receiving member. May accumulate in the space. At this time, the slide distance of the rod may be shortened due to dirt or mud accumulated in the space, and the rod may not slide.

  An object of the present invention is to provide a tension applying mechanism in which a rod can be slid well.

The tension applying mechanism of the present invention urges the tensioning wheel in the tensioning direction of the crawler belt wound around the tensioning wheel and the plurality of rollers,
The first characteristic configuration includes a support member that rotatably supports the tension ring, a rod that has an end fixed to the support member, and a pipe that is fixed to a track frame that supports the plurality of wheels. A receiving member fixed to at least one of the track frame and the pipe, wherein the rod is inserted into the pipe, and the rod is slidable in the tension and relaxation directions of the crawler belt. , said receiving member and said spring receiver of said being repositionable supported tension and relaxation direction on one of the support member member, Ri Wataru to the other and the spring receiving member of said receiving member and said support member, said pipe adjacent to the outer peripheral portion and a compression spring which is extending parallel to and along said pipe, there opens the end opposite to the supporting member of the pipe Located in.

According to this configuration, even if soil or mud enters the inside of the pipe as the rod slides, the soil or mud that enters the pipe is discharged from the support member side of the pipe, Even if it enters the inside of the pipe, it is discharged from the end opposite to the pipe support member to the outside by opening the end opposite to the pipe support member. For this reason, soil, mud, etc. do not accumulate inside the pipe and the sliding distance of the rod does not become short. Therefore, the rod can slide and move satisfactorily.
According to a second characteristic configuration of the present invention, two rods are provided, two pipes are provided, the two rods and the two pipes are arranged in parallel, and the receiving member is provided between the pipes. It is in a certain point.
According to this structure, a receiving member can be arrange | positioned compactly using the space between two pipes.
According to a third feature of the present invention, two rods are provided, two pipes are provided, the two rods and the two pipes are arranged in parallel, and the compression spring is provided between the pipes. It is in a certain point.

A fourth characteristic configuration of the present invention is that the rod protrudes from an end portion of the pipe opposite to the support member in a state where the crawler belt is wound around the tension ring.

  According to this configuration, since the rod penetrates the pipe, pebbles and the like are unlikely to enter the gap between the rod and the end on the opposite side of the pipe support member, and pebbles and the like are difficult to bite. Therefore, the rod can slide smoothly. That is, when the rod is retracted from the end opposite to the pipe support member, a recess is formed by the rod and the end opposite to the pipe support member. Pebbles etc. tend to accumulate at the end. At this time, when the rod slides, pebbles and the like are likely to enter the gap between the rod and the end portion on the opposite side of the pipe support member, and pebbles and the like are easily bitten. On the other hand, in this configuration, since such a recess is not formed, pebbles and the like hardly accumulate at the end opposite to the pipe support member, and even if the rod slides, the pebbles and the like support the rod and the pipe. It is difficult to enter the gap with the end opposite to the member, and pebbles and the like are difficult to bite.

  Further, for example, when the tension ring is cantilevered by the support member, a force in the left-right direction is applied to the support member and the rod by a reaction force that the tension ring receives from the crawler belt. However, since the rod protrudes from the end opposite to the support member of the pipe, the pipe supports the rod over its entire length, so that the rod is difficult to bend left and right. In addition, the outer peripheral portion of the end surface of the rod does not slide on the inner peripheral surface of the pipe, and the outer peripheral portion of the end surface of the rod does not bite into and catch on the inner peripheral surface of the pipe. Therefore, the rod can slide smoothly.

The tension applying mechanism of the present invention urges the tensioning wheel in the tensioning direction of the crawler belt wound around the tensioning wheel and the plurality of rollers,
The fifth characteristic configuration includes a support member that rotatably supports the tension ring, a pipe fixed to the support member, and a rod having end portions fixed to a track frame that supports the plurality of wheels. A receiving member fixed to at least one of the track frame and the rod, wherein the rod is inserted into the pipe, and the pipe is slidable in the tension and relaxation directions of the crawler belt. , said receiving member and said spring receiver of said being repositionable supported tension and relaxation direction on one of the support member member, Ri Wataru to the other and the spring receiving member of said receiving member and said support member, said pipe adjacent to the outer peripheral portion and a compression spring which is extending parallel to and along said pipe resides in that are open ends of the support member side of the pipe

  According to this configuration, even if soil or mud enters the inside of the pipe as the pipe slides, the soil or mud that enters the pipe is discharged to the opposite side of the pipe support member. Even if it enters the inside of the pipe, it is discharged from the end of the pipe on the support member side to the outside by opening the end of the pipe on the support member side. For this reason, soil, mud, etc. do not accumulate inside the pipe and the sliding distance of the rod does not become short. Therefore, the rod can slide and move satisfactorily.

It is a side view which shows the tractor in 1st Embodiment. It is a side view which shows the crawler traveling apparatus in 1st Embodiment. FIG. 3 is a cross-sectional view taken along arrow III-III in FIG. 2 in the first embodiment. It is a cross-sectional view which shows the tension | tensile_strength provision mechanism in 1st Embodiment. It is a disassembled perspective view which shows the tension | tensile_strength provision mechanism in 1st Embodiment. It is a cross-sectional view which shows the tension | tensile_strength provision mechanism in 2nd Embodiment. It is a cross-sectional view showing a conventional tension applying mechanism.

[First Embodiment]
Hereinafter, a tractor equipped with the tension applying mechanism A according to the present invention will be described.

〔overall structure〕
As shown in FIG. 1, the tractor includes an engine ( not shown) and left and right front wheels 3 mounted on the front of the fuselage 1, a cabin 4, a mission case 5 and left and right crawlers mounted on the rear of the fuselage 1 And a traveling device 6.

(Crawler traveling device)
As shown in FIGS. 1 to 3, the crawler traveling device 6 includes a sprocket 12 attached to the rear axle 11 protruding from the mission case 5 and a support frame (not shown) attached to the lower portion of the mission case 5. A support bracket 13 that is swingably attached, a track frame 14 that is fixed to the lower portion of the support bracket 13, and a front idler 15 (tension ring) that is attached to the front of the track frame 14 via a tension applying mechanism A. 1), three grounded wheels 16 (an example of wheels) that are attached in the middle of the track frame 14 at an interval in the front-rear direction, and a rear idler 17 (idling wheels) that is attached to the rear of the track frame 14. 1), a guide 19 for preventing a wheel slip attached below the track frame 14, the sprocket 12, A track roller 16, before idler 15 crawler belt 18 and wound over a rear idler 17, and a.

(Tensioning mechanism)
As shown in FIGS. 4 and 5, a front end portion 14a is formed at the front portion of the track frame 14 so as to extend obliquely upward (upper left direction in FIG. 2). The attachment member 10 is fixed to the upper part of the distal end portion 14a. The mounting member 10 includes a front part 10a inclined obliquely forward and downward (in the direction of tension and relaxation of the crawler belt 18, the lower left direction in FIG. 2) and a rear part 10b inclined obliquely forward and upward. It is configured to be bent. The tension applying mechanism A is fixed across the front portion 10 a and the front idler 15.

  As shown in FIGS. 4 and 5, the tension applying mechanism A biases the front idler 15 diagonally forward and downward, and includes a support member 21 that rotatably supports the front idler 15, and a front side ( The left and right round rod-shaped rods 22 having one end, the support member 21 side, and the left end of the paper in FIG. 4 fixed to the support member 21, the rod 22 is inserted, and the lower portion is the mounting member 10. Left and right cylindrical pipes 23 fixed to the front portion 10a, a rectangular plate-shaped receiving member 24 that is erected on the front side portion 10a of the mounting member 10 and disposed between the ends of the left and right pipes 23; A spring receiving member 25 supported by the receiving member 24 so that the position thereof can be changed obliquely downward, an inner compression spring 26 and an outer compression spring 27 (an example of a compression spring) spanned between the support member 21 and the spring receiving member 25. ) And. Thereby, the support member 21 and the rod 22 are configured to be slidable obliquely downward.

  Further, the rear end of the pipe 23 is opened to form an opening 23a, and the crawler belt 18 is wound around the sprocket 12, the grounding wheel 16, the front idler 15, and the rear idler 17, The end of the rear side of the rod 22 (the other side, the side opposite to the support member 21, the upper side in FIG. 4) protrudes from the rear side end of the pipe 23.

  As shown in FIGS. 4 and 5, the support member 21 includes a rectangular plate-shaped rod support portion 31 that supports the rod 22 and a front idler support portion 32 that cantilever-supports the shaft portion 34 of the front idler 15. I have. The front end of the rod 22 is integrally fixed to the left and right sides of the lower portion of the rear side surface of the rod support portion 31. A columnar front engagement portion 33 that is inserted into the inner side of the front end portion of the inner compression spring 26 is integrally fixed to the left and right center sides of the upper and lower intermediate portions on the rear side surface of the rod support portion 31. Yes. An inner compression spring 26 and an outer compression spring 27 are provided in an inner and outer double cylinder shape. Accordingly, the front engagement portion 33 fixes the positions of the front end portions of the inner compression spring 26 and the outer compression spring 27. Further, the rear side surface of the rod support portion 31 functions as an abutting surface on which the front end portions of the inner compression spring 26 and the outer compression spring 27 abut.

  As shown in FIGS. 4 and 5, the receiving member 24 is located between the rear portions of the pipe 23. Each of the left and right side surfaces of the receiving member 24 is fixed to the left and right pipes 23, and is fixed to the front portion 10 a of the mounting member 10. The receiving member 24 has a screw hole 24a at the center thereof. The spring receiving member 25 includes a male screw portion 25a and a disk-like screw head 25b, and the male screw portion 25a is configured to be screwed into the screw hole 24a. An operation portion 25c having a hexagonal cross section is formed at the tip of the male screw portion 25a. The position of the spring receiving member 25 can be adjusted by rotating the spring receiving member 25 with a tool such as a wrench. It is. A nut 35 is screwed in the middle of the male screw portion 25a, and the position of the spring receiving member 25 adjusted by the nut 35 is fixed.

  As shown in FIGS. 4 and 5, a columnar rear engagement portion 36 to be inserted into the inner side of the rear end portion of the inner compression spring 26 is fixed to the front surface of the screw head 25 b. ing. Accordingly, the rear engagement portion 36 fixes the positions of the rear end portions of the inner compression spring 26 and the outer compression spring 27. Further, the front surface of the screw head 25b functions as an abutment surface on which the front end portions of the inner compression spring 26 and the outer compression spring 27 abut.

  The rod 22 and the pipe 23 into which the rod 22 is inserted are arranged side by side, and a receiving member 24, a spring receiving member 25, an inner compression spring 26, and an outer compression spring are disposed between the rod 22 and the rod 22. 27 are arranged in series. Thereby, the receiving member 24, the spring receiving member 25, the inner compression spring 26, and the outer compression spring 27 can be accommodated by effectively utilizing the space between the two rods 22 and the pipe 23 arranged in parallel. . Further, the inner compression spring 26 and the outer compression spring 27 can be prevented from being bent left and right by the two rods 22 and the pipe 23 arranged in parallel.

(Tensioning mechanism behavior during operation)
When the tractor operates on uneven ground, the rod 22 reciprocally slides inside the pipe 23 against the biasing force of the inner compression spring 26 and the outer compression spring 27. At this time, even if soil or mud enters the inside of the pipe 23, even if soil or mud that has entered the inside of the pipe 23 is discharged from the front side of the pipe 23 or enters the inside of the pipe 23, By opening the rear end of the pipe 23, the pipe 23 is discharged to the outside from the rear end. Therefore, the support member 21 and the rod 22 can be slid and moved satisfactorily without dirt, mud, etc. accumulating inside the pipe 23. Further, since the rear end portion of the rod 22 protrudes from the rear end portion of the pipe 23, pebbles and the like are unlikely to collect at the rear end portion of the pipe 23, and pebbles and the like are difficult to bite.

[Second Embodiment]
In the first embodiment, as shown in FIGS. 4 and 5, the rod 22 is fixed to the support member 21, and the pipe 23 is fixed to the front portion 10 a of the mounting member 10. On the other hand, in this embodiment, as shown in FIG. 6, the pipe 23 is fixed to the support member 21 and the rod 22 is fixed to the front portion 10 a of the mounting member 10. Therefore, in this embodiment, only a configuration different from the configuration of the first embodiment will be described, and the description of the same configuration will be omitted.

  Specifically, the tension applying mechanism A includes a support member 21 that rotatably supports the front idler 15, a receiving member 24 erected on the front portion 10 a of the mounting member 10, and a front side (one side) A pipe 23 integrally formed with the support member 21 so that the end of the side, the support member 21 side is fixed, and the pipe 23 inserted into the pipe 23 and the receiving member 24 on the rear side (the other side, the support member 21). The rod 22 is fixed to the opposite end of the rod 22, the spring receiving member 25 is supported by the receiving member 24 so that the position thereof can be changed obliquely downward, and the support member 21 and the spring receiving member 25 are installed. An inner compression spring 26 and an outer compression spring 27 (an example of a compression spring). Thereby, the support member 21 and the pipe 23 are configured to be slidable obliquely downward.

  In addition, the front end of the pipe 23 is opened to form an opening 23a, and the crawler belt 18 is wound around the sprocket 12, the grounding wheel 16, the front idler 15, and the rear idler 17, and the rod The front end portion of 22 is retracted from the front end portion of the pipe 23.

[Another embodiment]
(1) In the second embodiment, the crawler belt 18 is wound around the sprocket 12, the ground wheel 16, the front idler 15, and the rear idler 17, and the front end of the rod 22 is the front side of the pipe 23. However, instead of this, the crawler belt 18 is wound around the sprocket 12, the grounding wheel 16, the front idler 15, and the rear idler 17, and the front end of the rod 22. May protrude from the front end of the pipe 23 and the front idler support portion 32 may extend forward so that the rod 22 does not interfere with the front idler 15.

(2) In addition to the tractor, the tension applying mechanism A may be installed in a crawler traveling device for a combine or a backhoe. Specifically, a tension wheel is attached to one side of the track frame of the track frame of the combine or backhoe crawler travel device, a driving wheel is attached to the other side of the track frame, and a grounding wheel is installed in the middle of the track frame. The crawler belt may be wound around the tensioning wheel, the grounding wheel, and the driving wheel, and the tension applying mechanism A may be fixed across the track frame and the tensioning wheel.

(3) In each of the above embodiments, the front idler 15 is attached to the front of the track frame 14 via the tension applying mechanism A, and the rear idler 17 is attached to the rear of the track frame 14. Instead, the front idler 15 is attached to the front of the track frame 14, the rear idler 17 is attached to the rear of the track frame 14 via the tension applying mechanism A, or the front idler is attached to the front of the track frame 14 via the tension applying mechanism A. 15 and the rear idler 17 may be attached to the rear of the track frame 14 via the tension applying mechanism A.

(4) In the first embodiment, the receiving member 24 is illustrated as being fixed to the mounting member 10 and the left and right pipes 23. However, instead of such a configuration, the receiving member 24 is It is fixed to the attachment member 10 and may not be fixed to each of the left and right pipes 23. Alternatively, the receiving member 24 may be fixed to each of the left and right pipes 23 and not fixed to the attachment member 10.

(5) In the second embodiment, the configuration in which the receiving member 24 is fixed to the mounting member 10 is exemplified. However, instead of such a configuration, the receiving member 24 includes the mounting member 10 and the left and right rods. The receiving member 24 may be fixed to each of the left and right rods 22 and may not be fixed to the attachment member 10.

(6) In each of the above embodiments, the male receiving portion 25a of the spring receiving member 25 is screwed into the screw hole 24a of the receiving member 24, whereby the spring receiving member 25 is supported by the receiving member 24, and the support member 21 and the spring The configuration in which the inner compression spring 26 and the outer compression spring 27 are attached to the receiving member 25 is illustrated. However, instead of such a configuration, the male screw portion 25a of the spring receiving member 25 is used as a screw hole of the support member 21. By screwing, the spring receiving member 25 may be supported by the support member 21, and the inner compression spring 26 and the outer compression spring 27 may be attached across the receiving member 24 and the spring receiving member 25.

(7) In each of the above embodiments, the configuration in which the two rods 22 and the pipes 23 are arranged in parallel on the left and right is illustrated, but instead of such a configuration, the two rods 22 and the pipes 23 are arranged in parallel in the vertical direction. Also good. Further, the number of rods 22 and pipes 23 is not limited to two, but may be one or three or more.

  The tension applying mechanism of the present invention can be applied to various working machines such as a tractor and a construction machine.

14 Track frame 15 Tension wheel 16 Roller wheel 18 Crawler belt 21 Support member 22 Rod 23 Pipe 24 Receiving member 25 Spring receiving member 26, 27 Compression spring

Claims (5)

A tension applying mechanism that urges the tension ring in a tension direction of a crawler belt wound around the tension ring and a plurality of rollers,
A support member that rotatably supports the tension ring;
A rod having an end fixed to the support member;
A pipe fixed to a track frame that supports the plurality of wheels,
The rod is inserted into the pipe, and the rod is configured to be slidable in the tension and relaxation directions of the crawler belt,
A receiving member fixed to at least one of the track frame and the pipe;
A spring receiving member supported by one of the receiving member and the supporting member so that the position thereof can be changed in the tension and relaxation directions;
Ri Wataru to the other and the spring receiving member of said receiving member and said support member, and a compression spring which is extending parallel to and along the pipe adjacent the outer periphery of the pipe,
A tension applying mechanism in which an end of the pipe opposite to the support member is opened. Two rods, two pipes,
The two rods and the two pipes are arranged in parallel;
The tension applying mechanism according to claim 1 , wherein the receiving member is provided between the pipes . Two rods, two pipes,
The two rods and the two pipes are arranged in parallel;
The tension applying mechanism according to claim 1 or 2, wherein the compression spring is provided between the pipes. The tension applying mechanism according to any one of claims 1 to 3, wherein the rod protrudes from an end portion of the pipe opposite to the support member in a state where the crawler belt is wound around the tension ring. . A tension applying mechanism that urges the tension ring in a tension direction of a crawler belt wound around the tension ring and a plurality of rollers,
A support member that rotatably supports the tension ring;
A pipe fixed to the support member;
A rod having an end fixed to a track frame that supports the plurality of wheels,
The rod is inserted into the pipe, and the pipe is configured to be slidable in the tension and relaxation directions of the crawler belt;
A receiving member fixed to at least one of the track frame and the rod;
A spring receiving member supported by one of the receiving member and the supporting member so that the position thereof can be changed in the tension and relaxation directions;
A compression spring laid in parallel along the pipe adjacent to the outer periphery of the pipe across the other of the receiving member and the support member and the spring receiving member;
A tension applying mechanism in which an end of the pipe on the support member side is opened.

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